Abstract
The bacterium Xanthomonas fragariae causes the economically important angular leafspot disease to which a high level of resistance has not been found within the cultivated strawberry Fragaria × ananassa. The 2002 introduction of resistance donors ‘US 4808’ and ‘US 4809’ by the Fruit Laboratory at the Beltsville Agricultural Research Centre provided sources of resistance at the octoploid level derived from F. virginiana. Moving this resistance through three generations of back crossing to different recurrent F. × ananassa parents along with screening progeny for resistance with a spray inoculation method, followed by selection based on horticultural traits, has created improved resistant genotypes. Resistant × susceptible crosses have produced from zero to 21% resistant progeny with a mean of 4.8% for 25 crosses. The presence of undesirable traits, such as small and soft fruit, variegation, pistillate flowers, and susceptibility to powdery mildew, has slowed progress, but this linkage drag can be overcome by increasing screened population size and additional backcross generations. Two resistant × resistant crosses were made in 2009, yielding 32.2 and 32.7% resistant seedlings.
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Claims 6
Claim · model-written summary
Backcrossing resistance and screening created improved resistant strawberry genotypes.
- Taxon
- Strawberry
_single2.jpg?width=60)
Fragaria ×ananassat0 - Outcome
- improved resistant genotypese0
- Value
- three generationse0
Not reportedInteractor
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
t0“Strawberry Plants”
e0“Moving this resistance through three generations of back crossing to different recurrent F. × ananassa parents along with screening progeny for resistance with a spray inoculation method, followed by selection based on horticultural traits, has created improved resistant genotypes”
Claim · model-written summary
Resistant by susceptible crosses yielded zero to 21% resistant progeny, averaging 4.8% across 25 crosses.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- resistant progenye0
- Value
- from zero to 21%e0
- Qualifier
- a mean of 4.8% for 25 crossese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Strawberry Plants”
e0“Resistant × susceptible crosses have produced from zero to 21% resistant progeny with a mean of 4.8% for 25 crosses”
Claim · model-written summary
Undesirable traits slowed progress in breeding resistant strawberry.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- slowed progresse0
- Qualifier
- small and soft fruit, variegation, pistillate flowers, and susceptibility to powdery mildewe0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Strawberry Plants”
e0“The presence of undesirable traits, such as small and soft fruit, variegation, pistillate flowers, and susceptibility to powdery mildew, has slowed progress”
Claim · model-written summary
Increasing screening population size and backcross generations could overcome linkage drag.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- increasing screened population size and additional backcross generationse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Strawberry Plants”
e0“this linkage drag can be overcome by increasing screened population size and additional backcross generations”
Claim · model-written summary
One resistant by resistant cross yielded 32.2% resistant seedlings.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- resistant seedlingse0
- Value
- 32.2e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Strawberry Plants”
e0“Two resistant × resistant crosses were made in 2009, yielding 32.2 and 32.7% resistant seedlings”
Claim · model-written summary
The other resistant by resistant cross yielded 32.7% resistant seedlings.
- Taxon
- StrawberryFragaria ×ananassat0
- Outcome
- resistant seedlingse0
- Value
- 32.7%e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“Strawberry Plants”
e0“Two resistant × resistant crosses were made in 2009, yielding 32.2 and 32.7% resistant seedlings”